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