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