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