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