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