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