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