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