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