How to recruit PhD students when industry pays so much more?
The person who wants to go into industry is a different sort of person than one who wants a PhD. That isn't a universal, as some people want to do one to enable or enhance the other, but it is pretty generally true. You are likely a pretty good example yourself, so look at how you differ from those among your peers who chose as you did or otherwise. 

Therefore, think of the possible pool of candidates as bifurcated and try to appeal to those characteristics that are more likely to appeal to those in the desired half (well, less than half, probably). 

Future professors are likely more interested in ideas and personal growth and less interested in money. Both may want to do something to improve the world, of course, but in different ways. The potential PhD is more interested in deeper issues and longer term results than the general public. Future professors, especially, are obsessed with ideas and their development. 

Another positive aspect of the professorate and the desire for a PhD is the ability, in the large, to control your own schedule. You work all the time, of course, but you get to decide when to work and (mostly) what to work on. 

The people you probably are not going to attract are those with heavy life responsibilities already, and who really need that paycheck. On a more positive note, they are also more likely to want to do something now, rather than to work toward more distant goals. 

If you actually have access to some of the people you want to attract, then introduce them to interesting parts of your research and those of colleagues. Take them to an advanced class that you teach in some esoteric subject - maybe even one for which you are the premier source in the world. That is very cool. If you have research labs and advise advanced students, take them to a lab and ask them to contribute - ideas if nothing else. Introduce them to your advisees and assistants. Show them how wonderful it is to work with other smart people on important problems. 

When you speak to groups, emphasize the excitement of developing new ideas and how a new PhD is, at that moment, the world's foremost authority on some (perhaps small) thing. 

Finally, convince them that they will never be bored and that if they work with you, you will never waste their time. Then live up to that promise yourself, of course.