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