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