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