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