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