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)(13,14,17,18)(15,19,23,21)(16,20,24,25)(22,26,28,27)(5,7,8,12)(6,9,10,11)(13,15)(14,19)(16,22)(17,23)(18,21)(20,26)(24,28)(25,27)(1,2,3,4)(14,18)(15,21)(19,23)(20,25)(22,27)(26,28)(6,10)(9,11)(13,16)(14,20)(15,22)(17,24)(18,25)(19,26)(21,27)(23,28) involution — undirected(7,12)(9,11)(14,18)(15,21)(16,24)(19,23)(22,26)(27,28) 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.