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