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