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