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