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