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