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