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