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