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