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