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