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