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