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