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