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)(11,15)(12,13)(14,16)(17,18,23,19)(20,25,31,28)(21,27,32,24)(22,29,30,26)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19,23,18)(20,28,31,25)(21,24,32,27)(22,26,30,29)(1,3,4,7)(2,6,5,8)(10,13)(14,15)(17,20,30,21,23,31,22,32)(18,24,29,28,19,27,26,25)(9,11,12,16)(10,14,13,15)(17,21,30,31,23,32,22,20)(18,25,29,24,19,28,26,27)(2,5)(6,8)(20,31)(21,32)(24,27)(25,28) involution — undirectedA 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.