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