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