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