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