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