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