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