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