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