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