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