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