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