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