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