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