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