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