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