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