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