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