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