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