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