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