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