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