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