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