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