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