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