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