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