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