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