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