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