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