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