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