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