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