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