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