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