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