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