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