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