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