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