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