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