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