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