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