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