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