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