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