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