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)(13,14)(15,22)(16,25)(17,20)(18,21)(19,23)(24,27)(26,28)(1,2,3,4)(13,14,17,25,18,21,16,20)(15,22,26,19,24,27,23,28)(6,9)(10,12)(13,14)(15,19)(16,20)(17,25)(18,21)(22,23)(24,28)(26,27) involution — undirected(2,4)(5,7,8,11)(6,10,9,12)(13,15,18,24)(14,19,21,28)(16,26,17,23)(20,27,25,22)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.