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