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