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