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