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