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