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