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