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