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