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