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