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