One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(9,10)(11,13)(12,14)(15,16)(19,26)(21,28)(23,31)(24,25)(27,32)(29,30) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,14)(13,16)(17,18,22,20)(19,27,30,23)(21,25,28,24)(26,32,29,31)(1,3,4,7)(2,6,5,8)(9,11)(10,13)(12,16)(14,15)(17,19,28,29,22,30,21,26)(18,23,24,32,20,27,25,31)(2,5)(6,8)(11,16)(13,15)(17,20,22,18)(19,27,30,23)(21,24,28,25)(26,32,29,31)(10,14)(13,15)(17,21,22,28)(18,24,20,25)(19,29,30,26)(23,31,27,32)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.