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