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