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