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