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