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