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