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