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