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