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