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