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