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