Venue name structure for citing papers
There are a virtually unlimited number of conferences whose title is of the form:


  "[Society] [International] [Conference|Workshop|Symposium] on XYZ"


where "International" is optional and the optional "Society" is a big organization like IEEE, ACM, ACS, etc.

Since there's basically no information in the first part, the organizers and attendees of these conferences will tend to refer to them as the informative "XYZ", ignoring the preamble.  Citations often do the same (e.g., just "XYZ" as venue, and sometimes even just the initials), particularly in page-limited publications such as standard IEEE proceedings. 

The "XYZ, IEEE International Conference on" form is then a hybrid compromise that some venues use to put the informative bit up front while still keeping the full title.