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