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