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