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