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