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