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