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