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