One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,13,11,14,16,12,15)(17,18,21,25,20,24,27,23)(19,26,29,32,28,22,30,31)(2,5)(6,8)(9,11,12,10,14,15,13,16)(17,19,27,30,20,28,21,29)(18,22,23,32,24,26,25,31)(1,3,4,7)(2,6,5,8)(9,10,14,16)(11,13,15,12)(18,23)(19,28)(21,27)(22,31)(24,25)(26,32)(2,5)(6,8)(9,12,14,13)(10,11,16,15)(19,28)(22,26)(29,30)(31,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.