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