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