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