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