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