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