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