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)(17,18,21,20)(19,23,24,22)(25,26,29,27)(28,31,32,30)(2,5)(3,8)(10,12)(14,15)(17,19)(18,22)(20,23)(21,24)(25,26,29,27)(28,30,32,31)(2,5)(6,7)(11,16)(14,15)(19,24)(22,23)(25,27,29,26)(28,31,32,30)(1,2)(3,6)(4,5)(7,8)(9,11)(10,14)(12,15)(13,16)(17,19)(18,23)(20,22)(21,24)(25,28)(26,30)(27,31)(29,32) involution — undirected(1,3,4,8)(2,6,5,7)(9,12,13,10)(11,15,16,14)(17,20,21,18)(19,22,24,23)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.