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