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