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