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