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