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