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