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