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