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