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