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