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