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