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)(15,16)(17,22)(18,20)(19,21)(23,24)(25,27)(26,28)(1,2)(3,4)(13,15)(14,19)(16,20)(17,25)(18,21)(22,24)(23,26)(27,28) involution — undirected(6,9)(10,11)(14,20)(15,21)(17,26)(24,27) involution — undirected(5,6)(7,10)(8,9)(11,12)(13,15)(14,16)(17,23)(18,21)(19,20)(22,24)(25,26)(27,28) involution — undirected(5,7)(6,10)(8,12)(9,11)(13,16)(14,21)(15,20)(17,24)(18,19)(22,25)(23,28)(26,27) involution — undirected(13,17,18,26)(14,22,20,28)(15,23,21,25)(16,24,19,27)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.