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