One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,5)(3,8,4,7)(9,10)(11,14)(12,16)(13,15)(17,18,20,22)(19,21,23,24)(25,26,29,33)(27,30,35,39)(28,31,36,32)(34,37,40,38)(1,3,6,4)(2,7,5,8)(9,11,13,12)(10,14,15,16)(17,19)(18,21)(20,23)(22,24)(25,27,29,35)(26,30,33,39)(28,34,36,40)(31,37,32,38)(1,4,6,3)(2,7,5,8)(9,12,13,11)(10,14,15,16)(19,23)(21,24)(1,5,6,2)(3,8,4,7)(26,31)(28,36)(30,37)(32,33)(34,40)(38,39)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.