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