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