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