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