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