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