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