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