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