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