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