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