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