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