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