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