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