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