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