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