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