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