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