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