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