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