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