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