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