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