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