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