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