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