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