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