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