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