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