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