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