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