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