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