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