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