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