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