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