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)(17,18,21,26)(19,24,29,23)(20,30,22,25)(27,28,32,31)(2,5)(6,8)(9,11,13,12)(10,14,15,16)(17,18)(19,27)(20,25)(21,26)(22,30)(23,28)(24,31)(29,32)(9,12,13,11)(10,14,15,16)(17,19,21,29)(18,23,26,24)(20,28,22,31)(25,32,30,27)(17,19,21,29)(18,24,26,23)(20,28,22,31)(25,27,30,32)(1,3,4,7)(2,6,5,8)(17,20,21,22)(18,25,26,30)(19,28,29,31)(23,32,24,27)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.