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