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