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