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