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