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