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)(13,14,20,24)(15,18,23,19)(16,26,28,21)(17,22,27,25)(1,2,3,4)(13,15,19,14,20,23,18,24)(16,26,27,22,28,21,17,25)(6,9)(10,12)(13,16)(14,21)(15,25)(17,19)(18,27)(20,28)(22,23)(24,26) involution — undirected(13,17,20,27)(14,22,24,25)(15,21,23,26)(16,19,28,18)(5,7,8,11)(6,10,9,12)(13,18,20,19)(14,15,24,23)(16,27,28,17)(21,25,26,22)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.