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