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