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