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