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