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