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