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