How to present my work experience in a PhD interview?
The first part:

If this is going to happen in front of the interview panels only (not with other applicants), then it is better to prepare for a detailed discussion. A detailed discussion includes a powerpoint presentation of your work, what would you do in future, etc. Also, you must expect some direct questions like "Why this is good for our organisation?" type questions. This part seems more like a personal discussion.

The second part:

If this is with other applicants, then there is no point being too specific and detailed about your PhD works. It is good enough to know the general knowledge of this field and some degree of the thesis that you have proposed in your PhD. You should be able to actively communicate and agree/disagree with others, very intellectually.

Good luck!