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