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