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