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