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