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