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