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