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)(13,14)(15,16)(17,20)(18,19)(21,22,26,24)(23,28,25,27)(5,6)(7,9)(8,10)(11,12)(14,19)(15,17)(21,22,26,24)(23,27,25,28)(7,12)(9,11)(13,15,18,17)(14,20,19,16)(21,23,26,25)(22,27,24,28)(1,2)(3,4)(5,7,8,12)(6,9,10,11)(13,16)(14,15)(17,19)(18,20)(21,24,26,22)(23,27,25,28)(5,6)(7,11)(8,10)(9,12)(13,17,18,15)(14,20,19,16)(21,25,26,23)(22,27,24,28)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.