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