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