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