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