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