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