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