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