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