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