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