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