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