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