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