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