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