How can I meet IITM CSE faculty and students?

How can I meet any of the faculty members?
You can meet any of the faculty by fixing an appointment; the best way to do this to email them. If you come without appointment, you may have to wait in vain...the faculty generally have tight schedules.

How can I meet any of the students?
Again, the best way is to email them. Most of the students have a webpage. Else, contact the CS office here.