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