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