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