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