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