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