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