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