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)(11,16,22,24)(12,17,20,21)(13,23,19,14)(25,26,30,34)(27,35,37,31)(28,38,36,32)(29,33,39,40)(1,2,4,6)(3,5,8,7)(9,11)(10,16)(12,13)(14,21)(15,22)(17,23)(18,24)(19,20)(25,27)(26,31)(28,39)(29,36)(30,37)(32,40)(33,38)(34,35)(1,2)(3,5)(4,6)(7,8)(9,12)(10,17)(11,19)(13,22)(14,16)(15,20)(18,21)(23,24)(25,28,30,36)(26,32,34,38)(27,29,37,39)(31,33,35,40)(3,8)(5,7)(9,12)(10,17)(11,13)(14,24)(15,20)(16,23)(18,21)(19,22)(25,27)(26,31)(28,29)(30,37)(32,33)(34,35)(36,39)(38,40) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,13)(10,14)(11,20)(12,22)(15,19)(16,17)(18,23)(21,24)(25,29)(26,33)(27,36)(28,37)(30,39)(31,38)(32,35)(34,40) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,14)(10,13)(11,21)(12,16)(15,23)(17,22)(18,19)(20,24)(25,26)(27,31)(28,32)(29,33)(30,34)(35,37)(36,38)(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.