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