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