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