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