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