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