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