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