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