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