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