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