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