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