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