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