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