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