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