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