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