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