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