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