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