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