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