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