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