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