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