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