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)(13,14,20,26,19,24,18,23)(15,25,28,21,22,27,17,16)(5,6)(7,11)(8,10)(9,12)(13,15)(14,21)(16,24)(17,20)(18,28)(19,22)(23,27)(25,26) involution — undirected(1,2,3,4)(5,7)(6,9)(8,12)(10,11)(13,16,19,21)(14,22,24,15)(17,23,28,26)(18,27,20,25)(7,12)(9,11)(13,17,20,15,19,28,18,22)(14,16,26,25,24,21,23,27)(6,10)(9,11)(15,22)(16,21)(17,28)(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.