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