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