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