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