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