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