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