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