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