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)(13,14,17,20)(15,22,26,28)(16,21,24,19)(18,27,23,25)(2,4)(6,9)(10,12)(13,14,16,19,17,20,24,21)(15,18,25,22,26,23,27,28)(2,4)(13,14)(15,23)(16,19)(17,20)(18,26)(21,24)(22,27)(25,28) involution — undirected(5,7,8,11)(6,10,9,12)(13,15,24,27,17,26,16,25)(14,18,21,28,20,23,19,22)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.