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