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