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