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