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