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