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