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