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