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