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