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