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