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