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