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