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