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