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