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