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