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