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