One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10,13,15)(11,14,12,16)(18,23)(19,26)(25,31)(28,32)(2,5)(6,8)(9,11,13,12)(10,14,15,16)(17,18,21,23)(19,27,26,29)(20,28,24,32)(22,31,30,25)(9,12,13,11)(10,14,15,16)(17,19)(18,24)(20,23)(21,26)(22,32)(25,29)(27,31)(28,30)(17,20,21,24)(18,19,23,26)(22,27,30,29)(25,32,31,28)(1,3,4,7)(2,6,5,8)(18,23)(19,26)(25,31)(28,32)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.