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