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