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