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