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