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)(13,14,16,18)(15,19,20,17)(21,22)(23,27)(24,28)(25,26)(6,9)(10,11)(13,15,16,20)(14,17,18,19)(21,23)(22,24)(25,28)(26,27)(6,9)(10,11)(15,20)(17,19)(22,26)(23,28) involution — undirected(1,2)(3,4)(5,7,8,12)(6,10,9,11)(13,14)(15,19)(16,18)(17,20)(21,24)(22,23)(25,27)(26,28)(5,6)(7,11)(8,9)(10,12)(13,15)(14,17)(16,20)(18,19)(21,22)(23,27)(24,28)(25,26) 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.