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