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