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