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