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