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