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