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