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