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