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