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