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)(17,18,21,24)(19,25,26,32)(20,29,27,23)(22,30,31,28)(2,5)(6,8)(9,11,12,15)(10,13,14,16)(19,26)(22,31)(25,32)(28,30)(17,19,27,30,21,26,20,28)(18,22,29,32,24,31,23,25)(10,14)(13,16) involution — undirected(1,3,4,7)(2,6,5,8)(19,26)(22,31)(25,32)(28,30)A 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.