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