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)(11,17)(12,20)(13,16)(14,18)(15,22)(19,23)(21,24)(27,33)(30,34)(35,39)(38,40)(1,3,5,8)(2,6,7,4)(9,10,13,16)(11,14,18,17)(12,15,22,20)(19,23,21,24)(25,26)(27,30)(28,36)(29,32)(31,37)(33,34)(35,40)(38,39)(1,2)(3,4)(5,7)(6,8)(11,18)(14,17)(19,21)(23,24)(25,26,29,32)(27,30,33,34)(28,31,37,36)(35,38,39,40)(1,4)(2,3)(5,6)(7,8)(9,11)(10,14)(12,21)(13,18)(15,24)(16,17)(19,22)(20,23)(25,26)(27,34)(28,31)(29,32)(30,33)(35,40)(36,37)(38,39) involution — undirected(1,3)(2,4)(5,8)(6,7)(9,12)(10,15)(11,19)(13,22)(14,23)(16,20)(17,24)(18,21)(25,27)(26,30)(28,35)(29,33)(31,38)(32,34)(36,40)(37,39) involution — undirected(1,4)(2,3)(5,6)(7,8)(9,10)(11,14)(12,15)(13,16)(17,18)(19,23)(20,22)(21,24)(25,28)(26,31)(27,35)(29,37)(30,38)(32,36)(33,39)(34,40) 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.