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