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