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