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