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