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