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