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