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