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