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