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