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