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