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