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