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