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