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