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)(13,14,18,25,17,21,16,20)(15,22,26,27,23,19,24,28)(2,3)(5,6)(7,11)(8,10)(9,12)(15,23)(19,22)(24,26)(27,28) involution — undirected(5,7)(6,9)(8,12)(10,11)(13,14,17,21)(15,19,23,22)(16,25,18,20)(24,28,26,27)(1,3,4,2)(7,12)(9,11)(13,15,17,23)(14,19,21,22)(16,24,18,26)(20,27,25,28)(6,10)(9,11)(15,23)(19,22)(24,26)(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.