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