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