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