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