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