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