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