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