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)(11,15)(12,14)(13,16)(19,25)(22,28)(26,31)(29,32) involution — undirected(2,5)(6,8)(9,11,12,16)(10,13,14,15)(19,26)(20,27)(22,29)(24,30)(25,31)(28,32)(1,3,4,7)(2,6,5,8)(10,14)(11,16)(17,18,21,23)(19,22,25,28)(20,24,27,30)(26,29,31,32)(10,14)(13,15)(17,19,27,31,21,25,20,26)(18,22,30,32,23,28,24,29)(2,5)(6,8)(10,14)(13,15)(18,23)(19,25)(24,30)(26,31) 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.