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