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