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