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