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