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