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