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