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