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