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