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