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