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