There is a map of the campus facilities on the University website here: http://www.exeter.ac.uk/visit/directions/streathammap/
But I've also edited this with the help of a spreadsheet, to make it easier to use and such, if you wanted to use it:
http://bennelliott.t35.com/ex_map.xls (you might need to copy and paste it into a new tab/window)
Let me know if you find it useful or any changes that might come in handy.
Find out how you've done here