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