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