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