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