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