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