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