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