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