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