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