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