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