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