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