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