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