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