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