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