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