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