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