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)(25,26,30,35,31,36,29,34)(27,37,38,40,28,33,39,32)(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)(25,27,31,28)(26,32,36,40)(29,38,30,39)(33,34,37,35)(1,3,4,7)(2,6,5,8)(10,14)(11,17)(16,21)(18,23)(25,28,31,27)(26,33,36,37)(29,38,30,39)(32,34,40,35)(2,5)(6,8)(9,12,13,19)(10,16,14,21)(11,18,17,23)(15,22,20,24)(25,29,31,30)(26,34,36,35)(27,38,28,39)(32,37,40,33)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.