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