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