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