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