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