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