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