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