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