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