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