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