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