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