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)(13,14,18,16)(15,17,20,19)(21,22,25,23)(24,26,28,27)(5,7,10,8)(6,9,11,12)(13,15,18,20)(14,19,16,17)(21,23,25,22)(24,26,28,27)(6,11)(9,12)(15,20)(17,19)(21,24,25,28)(22,26,23,27)(1,2)(3,4)(5,8,10,7)(6,12,11,9)(13,16,18,14)(15,19,20,17)(5,9,10,12)(6,8,11,7)(13,17,18,19)(14,15,16,20)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.