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