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