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