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