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