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