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