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