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