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