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