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