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