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