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