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