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