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