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