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