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