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