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