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)(11,15)(12,16)(13,14)(18,22)(20,23)(27,31)(28,29)(1,3)(2,6)(4,7)(5,8)(10,14)(12,15)(25,26,30,32)(27,28,31,29)(2,7)(3,8)(9,11,13,16)(10,12,14,15)(17,18)(19,23)(20,24)(21,22)(25,27)(26,28)(29,32)(30,31)(1,3)(2,4)(5,8)(6,7)(9,11)(10,15)(12,14)(13,16)(17,19,21,24)(18,23,22,20)(25,28,30,29)(26,31,32,27)(1,4)(2,3)(5,6)(7,8)(9,12,13,15)(10,11,14,16)(17,20,21,23)(18,24,22,19)(25,29,30,28)(26,27,32,31)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.