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