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