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