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