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