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