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