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