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