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