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