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