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