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