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