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