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