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