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