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