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