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