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