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