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