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