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