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