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