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