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