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