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