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