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