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