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