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