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)(11,14)(12,19)(13,15)(16,21)(17,23)(18,24)(20,22)(25,26,31,33)(27,37,39,32)(28,40,38,34)(29,35,36,30)(3,7)(5,8)(9,11,13,17)(10,14,15,23)(12,20,21,18)(16,24,19,22)(25,27,31,39)(26,32,33,37)(28,36,38,29)(30,40,35,34)(1,2)(3,5)(4,6)(7,8)(10,15)(11,17)(16,19)(18,20)(26,33)(28,38)(29,36)(32,37) involution — undirected(9,10)(11,14)(12,16)(13,15)(17,23)(18,22)(19,21)(20,24)(25,28,31,38)(26,34,33,40)(27,36,39,29)(30,37,35,32)(1,3)(2,5)(4,7)(6,8)(9,11)(10,14)(12,18)(13,17)(15,23)(16,22)(19,24)(20,21)(25,29,31,36)(26,35,33,30)(27,38,39,28)(32,40,37,34)(1,2)(3,5)(4,6)(7,8)(9,12,13,21)(10,16,15,19)(11,18,17,20)(14,22,23,24)(25,30,31,35)(26,36,33,29)(27,34,39,40)(28,37,38,32)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.