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