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