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