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