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