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