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)(11,14)(12,17)(13,16)(15,20)(18,22)(19,24)(21,23)(25,26,30,33)(27,28,35,31)(29,32,39,40)(34,36,37,38)(3,7)(5,8)(9,10)(11,14)(12,15)(13,16)(17,20)(18,22)(19,23)(21,24)(25,27,30,35)(26,31,33,28)(29,34,39,37)(32,38,40,36)(1,2)(3,5)(4,6)(7,8)(10,11)(15,17)(16,18)(23,24)(25,27,30,35)(26,31,33,28)(29,34,39,37)(32,38,40,36)(1,3,4,7)(2,5,6,8)(9,11,14,10)(12,17,20,15)(13,16,22,18)(19,23,21,24)(25,27)(26,28)(29,37)(30,35)(31,33)(32,38)(34,39)(36,40)(1,2)(3,5)(4,6)(7,8)(9,12)(10,15)(11,17)(13,21)(14,20)(16,24)(18,23)(19,22)(25,28)(26,27)(29,38)(30,31)(32,37)(33,35)(34,40)(36,39) involution — undirected(9,13)(10,16)(11,18)(12,19)(14,22)(15,23)(17,24)(20,21)(25,29)(26,32)(27,34)(28,36)(30,39)(31,38)(33,40)(35,37) 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.