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