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