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