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