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