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