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