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